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Published January 26, 2016 | Supplemental Material
Journal Article Open

Highly Efficient Light-Driven TiO_2–Au Janus Micromotors

Abstract

A highly efficient light-driven photocatalytic TiO_2–Au Janus micromotor with wireless steering and velocity control is described. Unlike chemically propelled micromotors which commonly require the addition of surfactants or toxic chemical fuels, the fuel-free Janus micromotor (diameter ∼1.0 μm) can be powered in pure water under an extremely low ultraviolet light intensity (2.5 × 10^(–3) W/cm^2), and with 40 × 10^(–3) W/cm^2, they can reach a high speed of 25 body length/s, which is comparable to common Pt-based chemically induced self-electrophoretic Janus micromotors. The photocatalytic propulsion can be switched on and off by incident light modulation. In addition, the speed of the photocatalytic TiO_2–Au Janus micromotor can be accelerated by increasing the light intensity or by adding low concentrations of chemical fuel H_2O_2 (i.e., 0.1%). The attractive fuel-free propulsion performance, fast movement triggering response, low light energy requirement, and precise motion control of the TiO_2–Au Janus photocatalytic micromotor hold considerable promise for diverse practical applications.

Additional Information

© 2015 American Chemical Society. Received 21 September 2015. Date accepted 23 November 2015. Published online 23 November 2015. Published in print 26 January 2016. The financial support from the NSFC (21274047) and the Specialized Research Fund for the Doctoral Program of the Education Ministry (20120172110005) is gratefully acknowledged.

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Supplemental Material - nn5b05940_si_002.zip

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